Device for eliminating an adherent substances in the industrial waste incinerator

ABSTRACT

A device for eliminating adherent substances on a furnace wall comprises a hollow rod which can reciprocate in a certain range in proximity to the furnace wall and in parallel to the surface of the furnace wall, scrapers which are provided on the rod, and an air injection nozzle which is provided near the scraper. By moving the scrapers relative to and in parallel with the furnace wall which rotates continuously, the adherent substances sticking to the furnace wall are taken off by means of the scrapers. The adherent substances taken off are blown away by the injection of compressed air from the air injection nozzle. Simultaneously therewith, local combustion is rapidly induced to perfectly burn the adherent substances.

United States Patent Hayakawa et al.

i 1 Nov. 11, 1975 l l DEVICE FOR ELIMINATING AN 1.929.880 10/1933 Darrah110/14 ADHERENT SUBSTANCES [N THE 2.391.443 12/1945 Bruton 15/104161 X3.025.548 3/1962 Benkenstein l5/l()4.l6 INDUSTRIAL WASTE INCINERATOR3.667.743 6/1972 Kovalcik et al 432/75 [75] Inventors: Shuichi Hayakawa,Tokyo; Toru 3.823.677 7/1974 Polsak 1 10/14 Hironaka; Yukinori Osada,both of Yamuguchi; Heihachiro fl, Primary E.\'un1inerKenneth W. SpragueT ky T r T kay ma. C hibu; Attorney, Agenl, r FirmStevens. Davis. Miller& Shiro Saito, Kanagawa. all of Japan Masher [73] Assignees: SankiEngineering Co., Ltd.; Mitsui Petrochemical Industry Co., Ltd., [57]ABSTRACT both of Tokyo Japan A device for eliminating adherentsubstances on a fur- [22] Fil d; J l 16, 1974 nacc wall comprises ahollow rod which can reciprocate in a certain range in proximity to thefurnace wall [21] Appl' 489062 and in parallel to the surface of thefurnace wall.

scrapers which are provided on the rod. and an air in- [30] ForeignApplication Priority Data jection nozzle which is provided near thescraper. B Mar H 197 4 Japan 49304) moving the scrapers relative to andin parallel with the l furnace wall which rotates continuously. theadherent [52] U5. CL 110/14. 15/104). 432/75 substances sticking to thefurnace wall are taken off 51 1m. c1.- F230 /06- B0813 9/08 by of theScruPm The adhere subsmlces [58] Field of Search /14. /104 16 taken offare blown away by the injection of compressed air from the air injectionnozzle. Simulta- [56] References Cited neously therewith, localcombustion is rapidly induced UNITED STATES PATENTS to perfectly burnthe adherent substances. 1.220.827 3/1917 Downs 432/ X 6 Claims, 4Drawing Figures m 4 I 5 6 23 13 15 r {I 3 4+ 1 J 1 r1 1 l l I L 2s 27 1el l L..l L..

U.S. Patent Nov. 11,1975 Sheet2of2 3,918,375

DEVICE FOR ELIMINATING AN ADHERENT SUBSTANCES IN THE INDUSTRIAL WASTEINCINERATOR This invention relates to an industrialwaste incinerator,and more particularly to a device for automatically eliminating adherentsubstances in the incomplete combustion state as stick inside a furnacewall.

When the distillation residue as well as the catalysis residue ofpetrochemical products, the plastics waste, or the like industrial wasteis burnt up, unburnt substances consisting of a highly viscous melt anda solid matter mixed together come to adhere to a furnace wall in lumpsor blocks with the lapse of time, and thus lower the combustioneffeciency. In case of a pan incinerator which is small in size, it ispossible to sometimes stop the running and to eliminate the adheringsubstances by the hand work. In case of a large-sized furnace such askiln type incinerator, however, the continuous running is made as arule, and hence, it is usually difficult to specially stop the runningin order to remove the adherent substances. It is therefore desired todevelop a technique for automatically eliminating the adhesive blocksduring the running of the furnace.

This invention intends to provide a device which eliminates thesubstances adhering to the furnace wall of the incinerator. To this end,according to the present invention, a hollow rod is mounted along thelengthwise direction of the furnace at a position close to the wall ofthe incinerator, and the adherent substances of the furnace wall aretaken off with a scraper by reciprocating the rod. Since the scraperreciprocates in contact with that part of the furnace wall to which thesubstances are prone to stick, the adherent substances on the whole areaof the furnace wall as covered by the stroke length of the reciprocationare fully scraped off. If left as it is, the scraped block has itssurface molten by the temperature of the interior of the furnace andadheres to the furnace wall again. For this reason, it is blown awaysimultaneously with the scraping by means of compressed air from an airinjection nozzle which is provided in proximity to the scraper, and itis locally burnt rapidly by the air supply. The component made inorganicby the rapid combustion does not stick to the furnace wall yet, and itrolls within the furnace and is automatically discharged. In actuality,the adherent substances of the incomplete combustion are depositedsubstantially continuously on the furnace wall in a certain range fromthe charging side towards the inner part of the kiln type incinerator. Apart of the adherent substances as lies on the charging side of thefurnace is comparatively hard and need be taken off by the action of thescraper, whereas a part on the inner side is somewhat fragile.Accordingly, when the hollow rod is moved in parallel with the furnacewall, the adherent substances on the furnace wall close to the chargingside are taken off by the scraper and are rapidly burnt by the blast ofthe compressed air. The adherent substances at the deeper part add tofragility gradually, and hence, they are almost blown away and burntrapidly by the blast of the compressed air, to be made inorganic and tobe gathered up by the scraper. In this way, it is possible to alwayskeep good the combustion state in the incinerator and to perfectly burnup and dispose the industrial waste.

As apparent from the above description, the principal object of thisinvention is to provide a device which 2 readily eliminates adherentsubstances on the wall of an industrial waste incinerator.

Another object of this invention is to provide a de vice which scrapesoff adherent substances sticking to the wall of an incinerator,simultaneously blows them away by air blast and simultaneously subjectsthem 10- cally to rapid combustion, so that the adherent substances canbe prevented from sticking again.

Still another object of this invention is to provide a device whicheliminates adherent substances on the wall of an incinerator by blowingthem away with compressed air and gathering them up with a scraper.

Yet another object of this invention is to provide a device whichscrapes away adherent substances on the wall of an incinerator,thereafter rapidly burns them into inorganic substances and thereafterautomatically discharges them, whereby the combustion state in thefurnace is made good, and the incinerating disposal of the industrialwaste is made effective.

Further objects of this invention will become more definite from thefollowing detailed description when read with reference to theaccompanying drawings, in which:

FIG. 1 is a side view showing the mounting of the device of thisinvention on a furnace body;

FIG. 2 is a plan view corresponding to FIG. 1;

FIG. 3 is an enlarged front view' taken in the direction of arrows of aline IIIIII in FIG. 1; and

FIG. 4 is an enlarged longitudinal section of a hollow rod as taken inthe direction of arrows of a line IV--IV in FIG. 3.

Throughout the drawings, like reference symbols designate likeconstituent parts.

The drawings illustrate a case where the present invention is applied toa rotary kiln type incinerator. FIG. 1 is a side view showing the hindhalf part of the rotary kiln type incinerator and an adhesion preventingdevice mounted thereon, while FIG. 2 is a plan view showing the same.

The kiln type furnace l is installed in a manner to slightly inclinewith its fore end lowered. A chute and a pushing-in device (not shown)for charging a material to-be-incinerated are provided at a rear openingportion 11 of the kiln type furnace. The incinerator burns the materialto-be-incinerated while slowly rotating the furnace body, and dischargesthe ash content from the fore end of the furnace body to the exterior ofthe incinerator.

As shown in the figures, a hollow rod 2 which is proximate to a furnacewall 10 and which can reciprocate in parallel to the wall surface isprovided on the back side of the furnace l. Scrapers 3 and 4 forremoving adherent substances are mounted at the fore end and anintermediate part of the hollow rod 2, respectively. A cylindermechanism 5 is provided near the hind end of the hollow rod 2 and inparallel with the hollow rod, and the end part of the rod 6 is joined tothe hind end of the hollow rod 2. Thus, a reciprocating mechanism isconstructed. It is also allowed to employ any other reciprocatingmechanism in which, by way of example, the cylinder mechanism isreplaced with a rack and pinion.

As enlarged and shown in FIGS. 3 and 4, the hollow rod 2 is equippedtherein with a pipe 7 for introducing compressed air, which pipe isjoined to an air injection nozzle 8 provided near the fore end scraper3. A pipe 9 for supplying cooling water is also inserted in the hollowrod 2.

The air injection nozzle 8 may alternatively be disposed at the scraper4 at the intermediate part of the rod. Further, the air injectionnozzles may be disposed at both the fore end scraper and theintermediate scraper.

As shown in FIG. 3, the scrapers 3 and 4 are arranged in proximity tothe furnace wall 10 at an acute angle to the rotational directionthereof, and are adapted to take off the adherent substances on the wallsurface. The injection nozzle 8 is led from an end plate 12 of thehollow rod 2, it is bent into an L-shape, and it opens near the loweredge of the fore end scraper 3.

As illustrated in FIG. 4, at the rear end part of the hollow rod 2, anend member 14 is secured through a flange portion 13, and it is coveredwith a cylindrical cap 15. The cylindrical cap 15 has a bracket 16. Therear end of the rod 6 of the reciprocating mechanism is fastened to apin 17 at the front end of the bracket 16. In the interior of thecylindrical cap 15, a pair of rings 18 and 19 are secured at aninterval, and a ring member 20 secured to the periphery of the endmember 14 is arranged between the rings 18 and 19. When the rod 6 of thereciprocating mechanism moves leftwards in FIG. 4, one ring 19 insidethe cylindrical cap 15 pushed the ring member 20 so as to move thehollow rod 2 leftwards. Conversely, when the rod 6 is moved rightwards,the other ring 18 pushes the ring member 20 so as to move the hollow rod2 rightwards.

The compressed air-introducing pipe 7 penetrates through the flangeportion 13 and orthogonally turns substantially in the middle of the endmember 14. It penetrates through the ring member 20 as well as thecylindrical cap 15. Then, it is joined to a compressed air source in theexterior. A water feed port 21 communicating to a flexible hose isprovided near the flange portion 13 of the hollow rod 2 and is joined tothe pipe 9, while a water exhaust port 22 communicating to a flexiblehose is provided at a position opposite to the water feed port 21. Thecooling water enters the pipe 9 from the water feed port 21, it flowsinto the hollow rod 2 from an open end of the pipe 9 near the front endof the hollow rod 2, and it passes through the interior of the hollowrod 2 as shown by an arrow in FIG. 4. After thus effecting cooling, itis discharged from the water exhaust port 22.

As shown in FIG. 4, a shear pin hub 23 is secured to that part of thehollow rod 2 which is close to the water feed and exhaust ports 21 and22. An opposite flange 24 is locked by a shear pin 25. The flange 24 isformed sidewards with a cylinder portion 26. At the lower part of thecylinder portion 26, there is provided a guide pin 27, which is insertedin a guide rail 28. Upon actuation of the reciprocating mechanism, thehollow rod 2 is reciprocated straight by the guide of the guide rail 28and the guide pin 27. The lump or block adhereing to the furnace wall 10is taken away by the scrapers 3 and 4. When the adherent matter becomesharder than is anticipated or any foreign matter sticks hard, itintrudes between the furnace wall 10 and the scraper 3 or 4. Then, theturning force of the furnace body is transmitted to the hollow rod 2,and the supporting portion for the hollow rod 2 is destroyed. When suchturning force arises, the shear pin 25 is broken to release the couplingwith the shear pin hub 23. The guide pin 27 is therefore disengaged fromthe guide rail 28. At the same time, it is indicated by, for example,the flickering of a lamp (not shown) that the scraper has bitted theadherent matter. After the bite of the scraper, the hol- 4 low rod 2 isretreated and is reset at the right position. A new shear pin 25 isinserted between the hub 23 and the flange 24. Thus, the reciprocationof the hollow rod 2 is restarted.

In the forgoing apparatus, the material to-beincinerated is charged fromthe rear portion 11 of the kiln type furnace 1. The material is burntwhile flames are being blown from the front end side and the kiln isbeing rotated. Then, several of the material to-beincinerated becomesincompletely burnt substances and adheres to the furnace wall 10. Ingeneral, the adherent substances are deposited almost continuously withthe lapse of time. Since they gradually increase in hardness, thereciprocating mechanism of the hollow rod 2 is actuated at, for example,every 2 3 hours before they become considerably hard.

In the adherent substances, a part on the furnace wall close to thecharging side 11 of the furnace is formed so hard that it need be takenoff by the action of the scrapers 3 and 4. A part in the depth of thefurnace is somewhat fragile.

The adherent substances deposited on the furnace wall 10 are rotatedwith the rotation of the furnace body. When the hollow rod 2 is moved inparallel with the furnace wall, the adherent substances on the furnacewall close to the charging side are struck by the scrapers 3 and 4 andare successively taken off. Simultaneously therewith, they are blownaway by the blast of compressed air of, for example, 2-5 kglcmpreferably 3-5 kglcm from the air nozzle 8 provided at the lower edge ofthe scraper. Thus, they are locally subjected to rapid combustion. Onthe other hand, the adherent substances on the furnace wall 10 at thedeeper furnace part gradually increase in fragility. Therefore, they aremostly blown away by the blast of the compressed air. They are rapidlyburnt to become inorganic, and are gathered by the scrapers. Theinorganic component after the rapid combustion owing to the presence ofthe compressed air is prevented from readhering onto the furnace wall,and it is discharged from the fore end of the furnace while rolling onthe bottom of the kiln.

The size, hardness etc. of the adherent substances to be produced on thefurnace wall differ in dependence on the composition of the materialto-be-incinerated, the amount of charge, the incinerating temperatureetc. If an automatic control system is assembled which automaticallyreciprocates the hollow rod at every several hours in which the adherentsubstances are so deposited as to be easily taken off by the movement ofthe scrapers, the elimination of the adherent substances will beachieved readily and automatically.

What we claim is:

l. A device for eliminating adherent substances on a furnace wall in anindustrial waste incinerator comprising:

a rotary kiln type incinerator;

a hollow rod which is inserted slidably in the interior of the furnacebody from that side of said incinerator on which an opening for charginga material tobe-incinerated is located;

scrapers for removing said adherent substances on said furnace wall,which are provided at the front end of said hollow rod and on at leastone intermediate part thereof;

an air injection nozzle which is open at a position adjacent to a loweredge of at'least one of said scrapers; and

means for introducing the compressed air to said air injection nozzle.

2. A device for eliminating adherent substances on a furnace wall in anindustrial waste incinerator comprising;

a rotary kiln type incinerator;

a hollow rod which is inserted in the interior of the furnace body fromthat side of said incinerator on which an opening for charging amaterial to-beincinerated is located, said hollow rod being capable ofreciprocating in a certain stroke range in proximity to said furnacewall and in parallel to the furnace wall surface;

scrapers for removing said adherent substances on said furnace wall,which are provided at the front end of said hollow rod and on at leastone intermediate part thereof, said each scraper being mounted aslant soas to define an acute angle to a rotational direction of said furnacewall;

means for cooling said hollow rod;

an air injection nozzle which is open at a position adjacent to a loweredge of at least one of said scrapers; and i a compressed air pipe whichis provided in the interior of said hollowrod in order to introducecompressed air to said air injection nozzle.

3. The device according to claim 1, wherein said cooling means comprisesa pipe which is shorter than said hollow rod and which is provided inthe interior of said hollow rod, and wherein a water feed portcommunicating to the shorter pipe is provided at an end part of saidhollow rod while a water exhaust port is provided at a position oppositeto said water feed port.

4. A device for eliminating adherent substances on a furnace wall in anindustrial waste incinerator, comprising:

a rotary kiln type incinerator;

a hollow rod which is inserted in the interior of the furnace body fromthat side of said incinerator on which an opening for charging amaterial to-beincinerated is located;

a reciprocating mechanism for reciprocating said hollow rod in a certainstroke range in proximity to one side surface of said furnace wall andin parallel to the furnace wall surface;

scrapers for removing said adherent substances on said furnace wall,which are provided at the front 6 end of said hollow rod and at anintermediate part thereof;

means for cooling said hollow rod;

an air injection nozzle which is open at a position adjacent to a loweredge of said scraper provided at said front end of said hollow rod;

a compressed air pipe which is provided in the interior of said hollowrod in order to introduce compressed air to said air injection nozzle;and

means for supporting said hollow rod to maintain accuratelyreciprocation of said hollowrod.

5. A device for eliminating adherent substances on a furnace wall in anindustrial waste incinerator comprising:

a rotary kiln type incinerator;

a hollow rod which is inserted in the interior of the furnace body fromthat side of said incinerator on which an opening for charging amaterial to-beincinerated is located;

a reciprocating mechanism for reciprocating said hollow rod in a certainstroke range in proximity to one side surface of said furnace wall andin parallel to the furnace wall surface;

scrapers for removing said adherent substances on said furnace wall,which are provided at the front end of said hollow rod and at anintermediate part thereof;

cooling pipe which is provided in the interior of said hollow rod;

an air injection nozzle which is open at a position adjacent to a loweredge of said scraper provided at said front end of said hollow rod;

a compressed air pipe which is provided in the interior of said hollowrod in order to introduce compressed air to said air injection nozzle;

a shear pin hub mechanism which is provided near an end part of saidhollow rod; and

a guide pin mounted at a lower part of a flange on one side of saidshear pin hub mechanism, as well as a guide mechanism for guiding thestraight reciprocation of said hollow rod in engagement with said guidepin.

6. The device according to claim 5, wherein said hollow rod is mountedwithin a cylindrical cap at the rear end of said rod, and said hollowrod is coupled with said reciprocating mechanism at a fore end positionof a bracket extending from said cap.

1. A device for eliminating adherent substances on a furnace wall in anindustrial waste incinerator comprising: a rotary kiln type incinerator;a hollow rod which is inserted slidably in the interior of the furnacebody from that side of said incinerator on which an opening for charginga material to-be-incinerated is located; scrapers for removing saidadherent substances on said furnace wall, which are provided at thefront end of said hollow rod and on at least one intermediate partthereof; an air injection nozzle which is open at a position adjacent toa lower edge of at least one of said scrapers; and means for introducingthe compressed air to said air injection nozzle.
 2. A device foreliminating adherent substances on a furnace wall in an industrial wasteincinerator comprising; a rotary kiln type incinerator; a hollow rodwhich is inserted in the interior of the furnace body from that side ofsaid incinerator on which an opening for charging a materialto-be-incinerated is located, said hollow rod being capable ofreciprocating in a certain stroke range in proximity to said furnacewall and in paralleL to the furnace wall surface; scrapers for removingsaid adherent substances on said furnace wall, which are provided at thefront end of said hollow rod and on at least one intermediate partthereof, said each scraper being mounted aslant so as to define an acuteangle to a rotational direction of said furnace wall; means for coolingsaid hollow rod; an air injection nozzle which is open at a positionadjacent to a lower edge of at least one of said scrapers; and acompressed air pipe which is provided in the interior of said hollow rodin order to introduce compressed air to said air injection nozzle. 3.The device according to claim 1, wherein said cooling means comprises apipe which is shorter than said hollow rod and which is provided in theinterior of said hollow rod, and wherein a water feed port communicatingto the shorter pipe is provided at an end part of said hollow rod whilea water exhaust port is provided at a position opposite to said waterfeed port.
 4. A device for eliminating adherent substances on a furnacewall in an industrial waste incinerator, comprising: a rotary kiln typeincinerator; a hollow rod which is inserted in the interior of thefurnace body from that side of said incinerator on which an opening forcharging a material to-be-incinerated is located; a reciprocatingmechanism for reciprocating said hollow rod in a certain stroke range inproximity to one side surface of said furnace wall and in parallel tothe furnace wall surface; scrapers for removing said adherent substanceson said furnace wall, which are provided at the front end of said hollowrod and at an intermediate part thereof; means for cooling said hollowrod; an air injection nozzle which is open at a position adjacent to alower edge of said scraper provided at said front end of said hollowrod; a compressed air pipe which is provided in the interior of saidhollow rod in order to introduce compressed air to said air injectionnozzle; and means for supporting said hollow rod to maintain accuratelyreciprocation of said hollow rod.
 5. A device for eliminating adherentsubstances on a furnace wall in an industrial waste incineratorcomprising: a rotary kiln type incinerator; a hollow rod which isinserted in the interior of the furnace body from that side of saidincinerator on which an opening for charging a materialto-be-incinerated is located; a reciprocating mechanism forreciprocating said hollow rod in a certain stroke range in proximity toone side surface of said furnace wall and in parallel to the furnacewall surface; scrapers for removing said adherent substances on saidfurnace wall, which are provided at the front end of said hollow rod andat an intermediate part thereof; cooling pipe which is provided in theinterior of said hollow rod; an air injection nozzle which is open at aposition adjacent to a lower edge of said scraper provided at said frontend of said hollow rod; a compressed air pipe which is provided in theinterior of said hollow rod in order to introduce compressed air to saidair injection nozzle; a shear pin hub mechanism which is provided nearan end part of said hollow rod; and a guide pin mounted at a lower partof a flange on one side of said shear pin hub mechanism, as well as aguide mechanism for guiding the straight reciprocation of said hollowrod in engagement with said guide pin.
 6. The device according to claim5, wherein said hollow rod is mounted within a cylindrical cap at therear end of said rod, and said hollow rod is coupled with saidreciprocating mechanism at a fore end position of a bracket extendingfrom said cap.